Uncommon Family Structure

I became sexually active at 37 with a married coworker. It was new to me, sex was messy, dirty, embarrassing, humiliating, regretful, you name it. When he got off I felt terrible. But, he knocks on the door, starts grabbing me and I can't stop it, my legs open, his dick goes in, he pulls his dick out and I have to deal with the leftovers till the next time. There is no emotional involvement.

I stopped using birth control, didn't tell him and let nature take it's course. He did not want anything to do with it, my daughter's, she started school this last fall, birth certificate shows mother's name, father's name UNKNOWN.

She gets lots of questions at school. No, she doesn't have a father. I've been accused of being lesbian many times. Not true, it's bad enough wiping your ass after sex, I can't imagine wiping my face clean after sex. Not that I've been having sex lately.

I guess, what is the best answer my daughter can give at school?